import numpy as np

nd1 = np.array([1, 2, 3, 4])
print(nd1)
print(type(nd1))
print(nd1.max())
print(nd1.min())
print(nd1.mean())
print(nd1.var())

nd2 = np.array([[1, 2, 3], [4, 5, 6]])
print(nd2, type(nd2))

# pip install jupyter notebook